1// SPDX-License-Identifier: GPL-2.0-only
 2/* Copyright(c) 2023 Intel Corporation. All rights reserved. */
 3#include <linux/module.h>
 4#include <linux/dax.h>
 5
 6#include "../cxl/cxl.h"
 7#include "bus.h"
 8
 9static int cxl_dax_region_probe(struct device *dev)
10{
11	struct cxl_dax_region *cxlr_dax = to_cxl_dax_region(dev);
12	int nid = phys_to_target_node(cxlr_dax->hpa_range.start);
13	struct cxl_region *cxlr = cxlr_dax->cxlr;
14	struct dax_region *dax_region;
15	struct dev_dax_data data;
16
17	if (nid == NUMA_NO_NODE)
18		nid = memory_add_physaddr_to_nid(cxlr_dax->hpa_range.start);
19
20	dax_region = alloc_dax_region(dev, cxlr->id, &cxlr_dax->hpa_range, nid,
21				      PMD_SIZE, IORESOURCE_DAX_KMEM);
22	if (!dax_region)
23		return -ENOMEM;
24
25	data = (struct dev_dax_data) {
26		.dax_region = dax_region,
27		.id = -1,
28		.size = range_len(&cxlr_dax->hpa_range),
29		.memmap_on_memory = true,
30	};
31
32	return PTR_ERR_OR_ZERO(devm_create_dev_dax(&data));
33}
34
35static struct cxl_driver cxl_dax_region_driver = {
36	.name = "cxl_dax_region",
37	.probe = cxl_dax_region_probe,
38	.id = CXL_DEVICE_DAX_REGION,
39	.drv = {
40		.suppress_bind_attrs = true,
41	},
42};
43
44module_cxl_driver(cxl_dax_region_driver);
45MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);
46MODULE_LICENSE("GPL");
47MODULE_AUTHOR("Intel Corporation");
48MODULE_IMPORT_NS(CXL);